Cloth feeder



W. BOLTER Sept. 1, 1936.

CLOTH FEEDER Filed Sept. 25, 1935 Patented Sept. 1, 1936 NETED STATES PATENT OFFIQE CLOTH FEEDER Wilhelm Bolter, Heepen, near Bielefeld, Germany 5 Claims.

The present invention relates to a device for cutting out the up and down movement of the feed dog of a sewing machine.

It is known in both oscillating shuttle machines 5 and swing shuttle machines to mount the roller which imparts the up and down motion to the feed dog adjustably, for the purpose of rendering the feed dog inoperative. This arrangement has the disadvantage, however, that the feed dog con- 10 tinues to move up and. down unnecessarily in its lowered position. It is further kcnwn to use axially adjustable coupling devices, by which the feeding motion of the feed dog is stopped.

It is also known to connect an eccentric driving 15 member for the cloth feeder selectively with its driving shaft or with a stationary part of the machine, so that in the latter case only the driving shaft rotates and no driving motion is imparted to the cloth feeder.

20 The object of the invention is to provide a simple cut out for sewing machines having a driving roller for the up and down movement of the feed dog engaging in the groove of a cam disk, and in which the unnecessary up and down movement of 25 the lowered feed dog is prevented and which offers a sure operation of the cut out means.

A particular feature of the invention is that the cam disk in which the roller for the up and 'down movement of the feed dog engages is guided in such a way that the part which causes the upmotion of the cloth feeder can be turned to an inoperative position, in which it no longer raises the feed dog.

The invention is illustrated in one embodiment in the drawing, which shows by way of example an oscillating shuttle sewing machine with a cam disk moving in a horizontal plane. In the draw- Fig. l is a plan view of the feed dog and its 40 appurtenant mechanism for the up and down motion,

Fig. 2 is a front elevation of the same, and

Fig. 3 is a detail view partly in section of the cam disk.

45 The feed dog i is mounted in known manner upon an arm 2 of a fork-shaped rocldng frame 3, which is rockably mounted upon two center points t. On the arm 5 of the rocking frame 3 is mounted a roller 6 which engages in the cam groove of the 50 cam body.

The cam body, is according to the invention,

7 made in two parts. To the upper part i a swinging oscillating shuttle carrier I5 is connected and for this purpose an arm 8 is provided. The driving motion is applied to the part I through an arm 9. The lower part It] of the cam body is mounted so as to be rotatable independently of the upper part 1. A locking catch H is pivotally mounted upon the lower part I and is adapted to engage in two different grooves l2 of the part 1, so that a rigid connection between the part 1 and the part i 8 in their two relative positions is provided.

In the position shown in Fig. 1, the hump of the lower part of the cam groove is adjusted so 10 that the rocking frame 3 with the feed dog I upon it is depressed and is not raised even during the back and forth swinging of the cam body 1, It]. On the other hand, when the part I!) is turned so that the catch l l engages in the other groove l2, the hump of the lower part of the cam groove comes into action and raises the rocking frame 3 during the machine operation.

I claim:

1. In a sewing machine, a feed dog, means for imparting an up and down motion to the same comprising an oscillating cam device operating a follower connected to said feed dog, said cam device being divided so that the part thereof which moves said follower can be set to an inoperative position in which it does not move said follower as said cam device oscillates.

2. A mechanismas described in claim 1, wherein said cam device comprises a pair of relatively adjustable disk elements embracing said follower.

3. A mechanism as described in claim 1, wherein a catch on one part of said cam device is e gageable with the other part of said cam device to lock said parts together in either of their two relative positions.

4. In a sewing machine, a feed dog, means for imparting an up and down motion to the same comprising a cam device oscillating in a horizontal plane and comprising two disk elements, a follower connected to said feed dog and embraced 0 by said disk elements, the upper one of said disk elements oscillating constantly between the same limits, the lower one of said elements being adjustable about the axis of oscillation of said cam device with respect to said upper element from an operative to an inoperative position, and means for locking said lower element to said upper element in each of said two relative positions.

5. A mechanism as described in claim 4, wherein said locking means comprises a catch pivoted to one of said elements and engageable with two different notches in the other of said elements.

WILHELM BoLTER.

CERTIFICATE OF CORRECTION.

Patent No. 2,052,599. September 1, 1956.

WILHELM BOLTER.

It is hereby certified that error appears in the above numbered patent requiring correction as follows: In the heading to the printed specification, line 6, foreign filing date in Germany, for "December 17, 1955" read December 17, 1954; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 6th day of October, A. D. 1956.

Henry Van Arsdale and Acting Commissioner of Patents.

(Seal) 

